Manifold system for internal combustion engines



v,Ju-ne 11, 1935. J. F. CHAPMAN ET A1. 2,004,192 MANIFOLD SYSTEM FOR INTERNAL COMBUSTION ENGINES Filed sept. 25, 1935 Fig'. l

Patented June 11, `1935 MANIFOLD 'PATENT4 ori-ICE 2,004,192 ,l l sYsTEM Fon INTERNAL (10M,-

` BUSYlgION ENGINES- James F. Chapman, Upper Darby, and Frederick I E. Dayes, Philadelphia, Pa., assignors to American Car and Foundry Motors Company, New York, N. Y., a corporation of Delaware Application september 25,1933, serial No. 690,895

3 Claims.

rIfhis invention relates generally to internal combustion engines, and has more particular l reference. to an intakemanifoldsystem for an internal combustion engine adapted for use i 5 motor vehicles such as motor buses.

engines be so formed and arranged that they dov not project above the floor level, otherwise housings covering projecting parts must be used and thus furnishfobstructions in the interior of the bus body. l

One object of the present invention is the provision of an internal combustion engine having an intake manifoldrsystem associated with a carburetor so arranged relative to the engine that when positioned in a bus it will be entirely below the floor level. i f

Another object of this invention is the provision of an intake manifoldsystem and carburetor for a horizontally arranged internal com'- bustio-n engine.

`Still'` another object of this invention is the provision of an internal combustion engine having'a plurality of cylinders and anV intake manifold system which is so arranged as to deliver fuel to the cylinders in a uniform and highly efficient manner.` l Y A further object of this invention is the provision of an intake manifold system for internal combustion engines Whichi's so formed andarranged as to deliver fuel mixture to the cylinders in independent streams,'each supplying a plurality of cylinders.

A still further object of this invention is the provision of an internal combustion engine adapted, when in service, to be horizontally arranged and having an intake manifold system and an exhaust manifold system arranged respectively above and below the engine and in` such a position that when the engine is installed in a bus or like motor vehicle, the engine and said manifold systems are entirely below the floor of the vehicle.

A still further objectof this invention is the `provision of a horizontally arranged internal combustion engine together with intake and exhaust manifold systems therefor, the engine and manifold systems being relatively so arranged that they are positioned entirely below the floor of a vehicle whereby the floor may be substantially a unitary or unbroken construction, thus eliminating the possibility of fumes from the exhaust line of the engine passing into the `interior of the body.

Other objects and advantages of this invention will be apparent from the following description. taken in lco'n'junction with `the accompanying "5' drawing, in which:

`Figure 1 is a top plan View of ,a portion ofV an internal combustion engine, showing the intake manifold 'system associated therewith, certain parts `being broken away to disclose other parts l0 more in detaiL'and Y i Fig. 2`i`sa side'` elevation of aportion of `an internal combustion engine, showing -the intake and exhaust manifold systems associated therewith, certain'parts being shown in section.

' Referring now more particularly to the drawing, in which Asimilar characters of reference designate similar parts inthe several views. A indicates an internalcombustion engine of the horizontal type-'that is,'one,in whichthe cylinders 2 20` are horizontally arranged so that the pistons 4 work horizontally in the cylinders. The engine A, as clearly shown in Fig. 2, is arranged below the. oor 6 of a vehicle. Inasmuch as the engine may be associated with any preferred or desired -type 25 ofvehicle, it is unnecessary to illustrate the vehicle other than-the floor 8 thereof.A

Y The engine A comprises a plurality of cylinders b 2 in whichthe pistons 4 are operable, the cylinders each being provided with an intake valve 8 and 30 the head portion ofthe enginebeing provided with a'valve cover I0, secured inposition by suitable fasteners, such as the bolts I2.)V

The intake valvesV 8 control passage of fuel from an intake manifoldV I4 secured in position by suit- 35 able fasteners, such as the bolts I6, the manifold I4 comprising, preferably, a casting having external chambers I8 cast integral therewith and adapted to receive water from the water jacket 20 of the engine, said portions I8 being adapted 40 to be connected to a water line 22 by bolts 24.` As clearly shown in Fig. 1, the intake manifold I4 extendslongitudinally of the engine along the upper surface thereof and approximately midway between its ends is provided with an internal 45 wall 26 which divides the manifold into portions 28 and 30, respectively, adapted each to supply fuel to three cylinders; the engine in the instance shown being of the six-cylinder type. For supplyingfuel to portions 28 and 30 of the manifold` 50 I4, branches 32 and 34 are connected, respectively, to said portions; the branches 32 and 34 being horizontally arranged and extending from the manifold for connection with a header 36.

The header 36 receives fuel from a hot box 38, 55

arranged above and communicating with the updraft carburetor 40. As can be clearly seen in Fig. 2, the carburetor 40 and hot box 38 are relatively vertically arranged and are in spaced relation horizontally with respect to the valve cover l of the engine A. This horizontal spacing, it will be apparent, permits an easy removal of the valve cover l0 from the engine, should occasion demand.

The engine A is provided with exhaust valves (not shown) for the several cylinders and they lead to an exhaust manifold 42 connected with'.

a suitable exhaust Yline and muliler, not shown. For supplying heat to the hot box 38,9. conduit leads from the exhaust manifold 42jto the hot box 38 and is provided with a suitable valve coni trolled by a lever 46 for regulating passage of exhaust gas to said hot box.' Asclearly shown in Fig. 2, the exhaust manifold 42 is arranged below the engine A, therefore being removed considerably from the floor 6 of the vehicle; this obviously preventing direct passage of heat from said exhaust manifoldr42 to the floor.y

From the above description it can be seen that the present invention providesintake Vand exhaust manifold systems for a horizontally disposed internal .combustion engine,rw`hich are arranged entirely below the-floor of a vehicle. The fuel mixture passes into the hot box 38, wherein unvaporized portions thereof are subjected to heat and pass, together with the remainder of the fuel, into the header 36, from where, due to operation of the pistons, the fuel isdrawn through the branches 32 and 34 into portions 28 and 30, respectively, 0f the .-intakemanifold I4. Due to the Yprovision, of the wall `26 in the manifold, thereis no starving of anyparticular cylinder, this reducing vibrationand furnishing uniform operation of the engine. Y i

The present invention comprises the combination with a. horizontally disposed or arranged in- Vternal combustion engine vof an intakemanifold system secured to the upper surface of the engine and discharging downwardly vinto the engineA cylinders and receiving fuel fromA a horizontally arranged header connected with a hot box*` which receives fuel Yfrom and is connected with a carburetor; the hotrbox and carburetor being in superposed relation and being arranged adjacent but spaced from the forward end portion or Valve cover of the engine. ThisV specific arrangement of partspermits the location of the engine and intake manifold system entirely below the floor of thevehicIe. c y

`The drawing herein illustrates one embodiment of the invention, but it is to be understood that it is for illustrative purposesk only and various changes in the form and proportions of the construction may be made within the spirit of the invention without departing from the scope of the appended claims.

Whatis claimed is: Y

` 1. In an internal combustion engine of the horizontal type having a removable cylinder head, an intake manifold and exhaust manifold, said intake manifold beingarranged above and discharging downwardly into the engine cylinders, branches leading from the intake manifold and extending substantiallyV adjacent to the cylinders and terminating beyond the cylinder head, a carburetor arranged in a Vertical'plane, aheader connecting the'intake manifold branches and the carburetor, Aa hot box between the carburetor and the intake manifold enclosing a portion of the header, and a connection between the exhaust manifoldand the hot box, said connection extending horizontally from the exhaust manifold to a position beyond the cylinder head and'being bent upwardly in substantially vertical alignment with the carburetor and terminating in said hot box.` i

2. ln an internal combustion engine of the horizontal type having a head portion, an intake manifold and exhaust manifold, Va carburetor positioned in spaced relation with the cylinder head and arranged in a Vertical plane intersecting a horizontal plane through the lower part of the head portion, connections between the manifolds and the carburetor, the connection between the intake Ymanifold and the carburetor extending parallel and approximately adjacent to the engine cylinders and the connection between the exhaust manifold and the carburetor being spaced a substantial distance'Y from the head; portion whereby space is provided for the removal of the latter.

3. In an` internal combustion engine of Vthe horizontal type, an intake manifold system inclucling amanifold secured to the upper surface y of the engine and discharging downwardly into the engine cylinders, branches leading from the manifold and extendingV substantially parallel to Y the enginecylinders, a carburetor spaced axially from the cylinders, a connection between the manifold branches and the carburetor, a hot box enclosingA a portion of said connection, an exhaust manifold, and a connection between the exhaust manifold spaced from the head of said engine and connecting with said hot box.

' JAlWES F. CHAPMAN.

FREDERICK E. DAYES. f -V 

